Bug 1469345: Enable remaining favicon tests in verify mode. r=Gijs

Differential Revision: https://phabricator.services.mozilla.com/D9832

--HG--
extra : moz-landing-system : lando

browser/base/content/test/favicons/browser.ini

@@ -20,7 +20,6 @@ support-files =
 support-files =
   file_favicon_change_not_in_document.html
 [browser_multiple_icons_in_short_timeframe.js]
-skip-if = verify
 [browser_rich_icons.js]
 support-files =
   file_rich_icon.html